Seems many folks are having issues lately on their BB machine NVRAM batteries failing (they do eventually), are loading a different game, or want to change game settings that can only be set once, and it turns out they don't have the all essential clear card. If you have a WMS machine, you always need to have a clear card for it!
Even if you only have one game. The NVRAM batteries will eventually die (easy to replace), but after you replace the batteries, you'll still need a clear card for it to work again. If you don't have one now, you will need one for your machine.
If you need a clear card for your WMS BB1, BB2, or BB3/Blade machine:
$35 + $5 shipping with USPS Ground Advantage = $40 total Need it faster or just don't like the slower speed of Ground Advantage, +$9 for USPS Priority Mail shipping = $44 total
Shipping includes insurance and tracking.
PM if if you need a clear card for your machine or have any questions.